The Millennium Hotel St. Louis,[3] more commonly known simply as the Millennium Hotel,[4] is a defunct hotel complex in downtown St. Louis, Missouri that closed in 2014. The lower complex consists of a plaza and several recreational facilities. Two towers, Millennium Hotel Tower I and Millennium Hotel Tower II, make up the hotel space. Tower I is 28 stories tall and was constructed in 1968. Tower II is 11 stories tall and was constructed in 1974. The building is adjacent to the Gateway Arch. Due to its closeness to several well known landmarks of St. Louis, it has become a popular tourist attraction. The hotel has 780 rooms and 19 suites.[5] It also features a restaurant called "Top of the Riverfront", a rotating restaurant on the 28th floor of Tower I.[6]

The Millennium Hotel was originally known as Stouffer's Riverfront Towers and later as the Regal Riverfront Hotel until it was acquired by Millennium Hotels and Resorts in 1999.[7] For many years it was also known as The Clarion Hotel.[8] It was designed by Tiernan Design and built by William B. Tabler Architects.[9] In 2006, Millennium Hotel and Resorts hired Jay Campbell as the hotel's general manager. It closed on Jan. 22, 2014. [10]